Increased surface spin stability in γ-Fe2O3 nanoparticles with a Cu shell

被引：33

作者：

Desautels, R. D. ^{[1
]}

Skoropata, E. ^{[1
]}

Chen, Y-Y ^{[2
]}

Ouyang, H. ^{[2
]}

Freeland, J. W. ^{[3
]}

van Lierop, J. ^{[1
]}

机构：

[1] Univ Manitoba, Dept Math & Astron, Winnipeg, MB R3T 2N2, Canada

[2] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan

[3] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2012年 / 24卷 / 14期

基金：

加拿大创新基金会;

关键词：

X-RAY-ABSORPTION; ELECTRONIC-STRUCTURE; SPECTRA; SPECTROSCOPY; TRANSITION; FE;

D O I：

10.1088/0953-8984/24/14/146001

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

gamma-Fe2O3 nanoparticles were coated with a Cu shell in situ during synthesis. An interfacial monolayer of CuO in the Cu-coated gamma-Fe2O3 nanoparticles was discovered that stabilized the disordered surface spins of gamma-Fe2O3 nanoparticles. Element-specific x-ray absorption spectroscopy at the L-edges for Cu and Fe indicated the magnetic moment of the Cu in the shell interacted with the gamma-Fe2O3 nanoparticle's surface magnetic moments. This exchange interaction between the Fe and Cu at the interface permitted an overall Cu moment in CuO (an antiferromagnet typically) that altered the gamma-Fe2O3 nanomagnetism. Increasing the Cu shell thickness also increased the total Fe magnetism of the nanoparticles.

引用

页数：11

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